[Media Router] Add origins to sink query results.

[Media Router] Add origins to sink query results.

Takes over https://codereview.chromium.org/1693963003/

Add |origins| to |OnSinksReceived| API from MRPM to MR.
If |origins| is non-empty, then the result of sink query
is only valid for those origins. Otherwise, the result is
valid for all origins, which is the legacy behavior. The
origin checking is done in base MediaSinksObserver class,
which will call into the version of |OnSinksReceived|
overridable by children classes.

BUG=594858
Review URL: https://codereview.chromium.org/1784533004

Cr-Commit-Position: refs/heads/master@{#381332}
(cherry picked from commit c9adbb1e8d955e1f658d92578ab5a51e4dbc8872)

Committed: https://chromium.googlesource.com/chromium/src/+/80b7d507c5a3f96feaa0b09276ef80692ab421fe

[imcheng, 2016-03-16 22:52:15]

Description was changed from

==========
[Media Router] Add origins to sink query results.

Takes over https://codereview.chromium.org/1693963003/

Add |origins| to |OnSinksReceived| API from MRPM to MR.
If |origins| is non-empty, then the result of sink query
is only valid for those origins. Otherwise, the result is
valid for all origins, which is the legacy behavior. The
origin checking is done in base MediaSinksObserver class,
which will call into the version of |OnSinksReceived|
overridable by children classes.

BUG=594858

Review URL: https://codereview.chromium.org/1784533004

Cr-Commit-Position: refs/heads/master@{#381332}
(cherry picked from commit c9adbb1e8d955e1f658d92578ab5a51e4dbc8872)
==========

to

==========
[Media Router] Add origins to sink query results.

Takes over https://codereview.chromium.org/1693963003/

Add |origins| to |OnSinksReceived| API from MRPM to MR.
If |origins| is non-empty, then the result of sink query
is only valid for those origins. Otherwise, the result is
valid for all origins, which is the legacy behavior. The
origin checking is done in base MediaSinksObserver class,
which will call into the version of |OnSinksReceived|
overridable by children classes.

BUG=594858

Review URL: https://codereview.chromium.org/1784533004

Cr-Commit-Position: refs/heads/master@{#381332}
(cherry picked from commit c9adbb1e8d955e1f658d92578ab5a51e4dbc8872)

Committed:
https://chromium.googlesource.com/chromium/src/+/80b7d507c5a3f96feaa0b09276ef...
==========

[imcheng, 2016-03-16 22:52:16]

Committed patchset #1 (id:1) manually as
80b7d507c5a3f96feaa0b09276ef80692ab421fe.